Aerodynamic Girders for RMGs



David Moosbrugger, Managing Director, Kuenz, Hard, Austria


Kuenz has been working on rail mounted gantry (RMG) cranes for intermodal terminals and river harbor terminals for many decades. As the market leader throughout Europe and North America, Kuenz has installed several hundred cranes throughout the world. Kuenz engineers in 2014 recognized that designing a RMG had become harder for the following reason: The cranes had become bigger. The largest Kuenz Cranes have a main girder length of over 140 metres, stack one over five, and their weight is over 700 tonnes. They are also faster, as the gantry speed for such a crane is 120 metres per minute, and trolley speed is 150 metres per minute. The wind surface of the structures had increased because of new codes and regulations. Customers were operating the cranes with wind speeds up to 28 metres per second. 

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